According to preliminary calculations by the World Weather Organization (WMO), the years from 2015 and 2019 are the hottest five-year period since the measurements began around 150 years ago. The average temperature during this period was 1.1 degrees above that of pre-industrial times. Compared to the previous five-year period, the increase was 0.2 degrees. This is clear from the new climate report of the WMO.

To keep the average temperature rise below 2 degrees by 2100, efforts to reduce greenhouse gases would have to be tripled, said WMO Director-General Petteri Taalas. To limit the warming to 1.5 degrees, a fivefold is necessary. Scientists think the two-degree goal is the least to avert a dangerous disruption of the world's climate.

Four years ago in the World Climate Agreement in Paris, 184 states had agreed to strive for a 1.5-degree limit. However, if all countries continue their current climate policy, it is more likely to expect a warming of between 3.0 and 3.4 degrees. Even if they fulfill their respective self-commitments, that would limit warming to just 2.6 to 2.9 degrees, experts estimate.

Yet another reminder of the #climatechange and the need for urgent #ClimateAction. #dataviz from @ anttilip # UniteBehindTheScience

- WMO | OMM (@WMO) September 21, 2019

"All the signals and consequences of climate change - sea-level rise, ice loss, extreme weather - have become stronger," the WMO reported. It is urgently necessary to set ambitious climate goals now. "Sea level rise is accelerating and we fear that a sharp decline in ice in Antarctica and Greenland will exacerbate development," Taalas said.

In the report, the WMO brings together new scientific findings on the dramatic decline in ice, sea-level rise, acidification of the oceans and the climatic causes of extreme heat waves, forest fires and floods.

Climate change - What if we do nothing? Forest fires, ice melt, storms: Man feels the global warming. What's the future like? Climatologist Stefan Rahmstorf explains our world 4 degrees more.